Wenger, who will leave Arsenal at the end of the season, was making his final trip to Old Trafford as Gunners boss and old rival Ferguson welcomed him with a warm embrace, handing him a piece of silverware as a gesture for his 22 years in English football.

Wenger and Ferguson were then joined by current United boss Jose Mourinho, as three of the Premier League's most successful managers posed for photos near the dugouts at Old Trafford.

And Wenger, who also received a warm reception from the Manchester United fans as he walked from the tunnel to his seat in the dugout, was grateful for United's pre-match gesture.

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Wenger was handed some end-of-season silverware at Old Trafford by his old nemesis Sir Alex Ferguson

Wenger was handed some end-of-season silverware at Old Trafford by his old nemesis Sir Alex Ferguson

"[It was] very nice," the Frenchman told Sky Sports.

"It was just another game for me but I'm very grateful for the gesture from Manchester United. It was very classy of them and you enjoy it.

Alexis Sanchez greets Wenger ahead of kick-off

"Apart from that I've come here for a long, long time and next year somebody else will sit on the bench and he'll get a very hostile reception, don't worry."

When asked about being flanked by Ferguson and Mourinho, he added: "It's a bit surprising because they're not always as you'd imagine, but it shows as well that life goes always on. Sometimes it gets better."

Wenger is greeted by Sir Alex Ferguson and Jose Mourinho at Old Trafford

In what could prove to be Wenger's final duel with old foe Mourinho, substitute Fellaini headed home to secure the home side's victory after former United playmaker Henrikh Mkhitaryan had cancelled out Paul Pogba's opener.

Despite the defeat, Wenger thought his much-changed side gave a very positive performance for such a young team.

Ander Herrera (L) vies with Reiss Nelson (R)

"It was a positive performance and overall it reflects a little bit our away season," he said. "We had chances, especially on counter-attacks.

"We did not always use well the opportunities we had but overall the team performance was positive for such a young team.

"It was very positive but of course they are very disappointed in the dressing room because they gave everything. In the last 20 minutes you could see some players were not used to that kind of intensity and pace and we looked a bit more under threat. In the first 70 minutes we didn't look really in danger at all."

Konstantinos Mavropanos (R) is challenged by Jesse Lingard (L)

Arsenal made eight changes with an eye on Thursday's crucial Europa League semi-final second leg at Atletico Madrid and man-of-the-match Ainsley Maitland-Niles and Konstantinos Mavropanos, who made his first appearance for the club, caught Wenger's eye.

"Both of them did well," he said. "The central defence did well today and Maitland-Niles as well.

"It's good to see them in such a strong atmosphere and see who has the courage to play, who can win challenges. We know their level but here you discover what they can do in the competition and that was interesting.

"Overall, I must say it's difficult to find a bad performance in our team but we have a bad result."